Aim
To report the precision of guided access cavity preparations in relation to demographical and dental variables in 50 patients.
Methodology
This observational study was carried out during the
period 2014–2017. The patients were consecutive referrals to a private
endodontic practice. The inclusion criteria were as follows: (i) pulp
space obliteration associated with signs of apical periodontitis (PAI
score >3 or sensitive to percussion, (ii) teeth with pulp space
obliteration in need of a post, where the referring dentist had
attempted or failed to negotiate the obliterated root canal (and it was
not possible to negotiate using the operating microscope within a
reasonable time frame) and (iii) a surgical intervention was not
justified. A published methodology for guided endodontics was used.
Measures on demographical and previous dental history were analysed and
related to drill path precision, being evaluated on radiographs as
optimal (centre of the root canal) or acceptable
(peripheral/tangential). The chi‐square test was used for analyses of
correlation between predictor variables and binary logistic regression
analysis using backward elimination with degree of obliteration, guided
access cavity preparation depth and precision as dependent variables.
Significance level was 0.05.
Results
Thirty‐one female (median age 65 year) and 19 males (median age 69 year) were enrolled. Overall, 88% (n = 44)
of the teeth had pulp space obliteration associated with signs of
apical periodontitis, whereas the remaining teeth were in need of a
post. The pulp space obliterations were longer in maxillary compared
with mandibular teeth (P = 0.024). The performance of the drill
path in mandibular teeth versus maxillary teeth resulted in a
significantly greater number of optimal precision scores (P = 0.033), and when a previous attempt at access and canal negotiation had occurred versus no attempt (P = 0.009). Even in cases with the worst outcome, the technique was still successful clinically.
Conclusions
The clinical implementation of guided root canal
treatment in fifty serial cases of single‐rooted teeth with pulp space
obliteration was associated with a precision that in all cases led to
the location and negotiation of the root canal and completion of the
treatment.
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